Abans de ser gran com una casa, el Clifford, quan era cadell, era el petit de la colla. Vivia a la ciutat amb l'Emily Elisabeth i la seva altra mascota, la Rosella, una conilleta dormilega i molt ben educada i que li ensenyava moltes coses.

Clifford's Puppy Days is a short-lived animated children's television series that originally aired on PBS Kids from 15 September 2003 to 13 October 2004. A spin-off of the original Clifford the Big Red Dog, it is set before the original series, and features the adventures of Clifford during his puppy days before he grew.

The series was cancelled in 2004 following low ratings. Reruns aired regularly following the cancellation, though they were halted in 2006. Since then, occasional reruns continue to air.

In the UK the show aired on CBeebies.

Les aventures de Clifford le gros chien rouge quand il n'était encore qu'un petit chiot.!